/* -*- coding: utf-8 -*-
 *
 * 170.cc: No.170 スワップ文字列(Easy) - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 8;

/* typedef */

/* global variables */

int fracs[MAX_N + 1], cs[26];

/* subroutines */

/* main */

int main() {
  string s;
  cin >> s;

  int n = s.size();
  for (int i = 0; i < n; i++) cs[s[i] - 'A']++;
  //for (int i = 0; i < 26; i++) printf("%d ", cs[i]); putchar('\n');

  fracs[0] = 1;
  for (int i = 1; i <= n; i++) fracs[i] = fracs[i - 1] * i;

  int cnt = 1;
  for (int i = 0; i < 26; i++)
    if (cs[i] > 0) {
      cnt *= fracs[n] / fracs[cs[i]] / fracs[n - cs[i]];
      n -= cs[i];
    }

  printf("%d\n", cnt - 1);
  return 0;
}